As an estimated 1.5 to two million people amassed on the National Mall yesterday to witness Barack Obama's inauguration as the 44th U.S. president, a high-resolution, Earth-orbiting satellite captured the action from 423 miles (681 kilometers) above Washington, D.C. The GeoEye 1 satellite revealed this sea of humanity while hurtling through space along the U.S. eastern seaboard at around 17,000 miles (27,350 kilometers) per hour, or about four miles (6.4 kilometers) per second.